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u in (-oo:+oo)
u/3 = 4.8 // - 4.8
u/3-4.8 = 0
1/3*u-4.8 = 0 // + 4.8
1/3*u = 4.8 // : 1/3
u = 4.8/1/3
u = 14.40000014
u = 14.40000014
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